Power supply for tattoo machine



FIG. 1 is a front perspective view of a power supply for tattoo machine showing my new design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a front elevation view thereof; and,

FIG. 7 is a top plan view thereof.

All broken-lines appearing in the drawings show unclaimed subject matter only and form no part of the claimed design. 

The ornamental design for a power supply for tattoo machine, as shown and described. 